While chemical rocket engines use chemical reactions during which the propellant is being ejected at high speeds thereby generating thrust, electric propulsion system utilize an electric field to achieve thrust. The electric field acting on the propellant, consisting of ions of an ionized neutral gas generated within the spacecraft. The ionization itself is possible to achieve in numerous ways, one of them is colliding high energy electrons with neutral atoms from the gas. Neutral gas is stored on the spacecraft in pressurised containers, while electrons are gained through a low pressure discharge by means of using a hollow cathode. Electric propulsion drives developed in this manner are used in maintaining satellites in desired orbits, and in spacecrafts required to travel great distances. Acceleration achieved through electric propulsion drives is small, but the spacecraft using it will reach greater velocities at a lower price financially. A spacecraft using the electric propulsion drive will be far more energy efficient and provide better results than a chemical rocket engine. Advantages for the electric propulsion drive numbered here do not mean the end of chemical rocket engines in space missions. One propulsion system helps correct the flaws of the other, but it surely opens the electric propulsion drive a gate to the stars.